National Electrical Installation Standards

Standards as High as Your Own

?
Wednesday, August 8, 2018

Question:

Hi Charlie, I am a third party independent electrical inspector in Northern New York State. I was in a local building supply store and I was talking to a store sales person who works the electrical supply section. He was explaining that installers are selection inspectors in my area based upon the application of certain provisions of the NYS Building Code and the 2014 NEC, specifically the requirement to install a four wire feeder between a service entrance pedestals and a single Family Dwelling located remotely. Am I wrong in requiring a 4 wire feeder between a service entrance pedestal and a single Family Dwelling located remotely from the service pedestal? Thank you for your time and I love reading your responses to the many code questions.

Don

A

Answer:

Hey Don thanks for your question and the compliment. You are correct. grounded conductors are not allowed to be reconnected to ground on the load side of the service disconnecting means as stated in 250.24(A)(5). Using a 120/240 volt single phase 3-wire feeder on the load side of the service is not allowed because both grounded equipment grounding conductors would be connected to it in the single family dwellings.

It is an unfortunate situation if there are multiple inspection options in the same area that have different interpretations or different levels of enforcement. Share your concerns with the municipality, utility and possible the local IAEI Chapter. Often in areas with multiple inspection agencies they are involved in the Chapter and that can be used as an educational opportunity to help with consistent and correct enforcement of the NEC rules.

ABOUT CQD: NECA’s Code Question of the Day (CQD) is a leading National Electrical Code® forum for NECA and the industry. The CQD generates a lively dialogue and relative practical and Code-based responses to an ever-increasing and interactive audience.

IMPORTANT NOTICE: All answers are based on the latest edition of the National Electrical Code®, unless the question requests a response based on a specific edition. This correspondence is not a formal interpretation of the NEC®. Any responses expressed to the questions are opinions and do not necessarily represent the official position of NECA, NFPA, or any technical committee. In addition, this correspondence is neither intended, nor should it be relied upon, to provide professional consultation or services.

ABOUT CHARLIE: Charles M. Trout, better known as Charlie, was a nationally known NEC® expert and author. He served on several NEC® technical committees and is past chairman of CMP-12. In 2006 Charlie was awarded the prestigious Coggeshall Award for outstanding contributions to the electrical contracting industry, codes and standards development, and technical training. Charlie was also a member of NECA’s Academy of Electrical Contracting. Charlie’s experienced team of industry experts keep the CQD dialogue and discussions active and informative in the spirit of the man himself, as he wanted.

NECA STANDARDS: NECA publishes the National Electrical Installation Standards™ (NEIS™), a series of ANSI-approved performance and quality standards for electrical construction. Visit NECA-NEIS.org for more information. NEISÔ can be purchased in three formats: as paper books, on CD, or as electronic downloads.

NECA SAFETY PRODUCTS: NECA publishes valuable electrical safety books and CDs for the industry. Visit necanet.org/store to view or purchase NECA safety products.

 CONTACT US: To submit a Code question, subscribe, or unsubscribe from this list, please e-mail: codequestion@necanet.org.